Pin, not so sure about... spring, I think you can get from yodave. I bought a 10% stronger spring from him for my 22 mag, and it eliminated failure to fire with federal ammo. Previously, the failure rate was about 50%. I was having a similar problem with some federal 22lr ammo in all my czs, so I swapped the 10% stronger spring temporarily into 2 of the 22lrs, and the guns fired reliably after that. I swapped the spring back into my 22 mag as it's a work gun and has to be reliable. Planning to buy more of those springs soon... Wonder if dave will give me a discount on half a dozen of them...